unchallenged
adjective C2- Not having any challengers.
- Lacking experience due to lack of challenges; untested.
- Undisputed, not called into question. · Many of his crazy ideas remained unchallenged.· The intruders went unchallenged.
From the library
But I could not rest, Watson, I could not sit quiet in my chair, if I thought that such a man as Professor Moriarty were walking the streets of London unchallenged.”
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